Fringe is handing us a new mystery to unravel as its fourth season winds down: What’s with all the new agents?!

Australian actress Georgina Haig, known down under for her roles in The Elephant Princess and Underbelly, has been cast in the potentially recurring role of Etta, a new Fringe agent who turns up in this season’s 19th episode. (Season 4 resumes March 23 with Episode 15.)

Etta is the partner of the new male agent to be played by Lost‘s Henry Ian Cusick.

It remains unclear if Haig and Cusick’s alter egos will be working “over here” or “over there.” (The original breakdowns described their characters as “Alternate Universe Agents,” but Cusick’s G-man was later described as an agent of the FBI, an organization that doesn’t exist “over there.” Confused? Join the club!)

Making things more complicated, the buzz is that Haig’s role has more long-term potential than the one filled by Cusick(who is currently attached to ABC’s midseason drama Scandal).

So WTF is Fringe cooking up? Is it merely a coincidence that Haig, like leading lady Anna Torv, is blonde and hails from Australia?! (Probably.) Hit the comments with your thoughts/theories.